一种新的求解变分不等式的惯性双次梯度外梯度算法（英文）

当可行集为一光滑凸函数的下水平集时,文献[Optimization,2020,69(6):1237-1253]提出了一种惯性双次梯度外梯度算法来求解Hilbert空间中的单调且Lipschitz连续的变分不等式问题.该算法在每次迭代中仅需向一个半空间计算两次投影,并得到了算法的弱收敛结果.本文通过使用黏性方法以及在惯性步采用新的步长来修正该算法.在适当的假设条件下证明了新算法所生成的序列能强收敛到变分不等式的一个解.此外,新算法在每次迭代中也仅需向半空间计算两次投影.     

Injective coloring of planar graphs with girth 5

A coloring of a graph G is injective if its restriction to the neighbour of any vertex is injective. The injective chromatic number X_i\left(G\right) of a graph G is the leastk such that there is an injective k-coloring. In this paper, we prove that for each planar graph with g\ge 5 and \Delta \left(G\right)\ge 20, {\chi }_i\left(G\right)\le \Delta \left(G\right)+3.     

含非线性光学活性侧基的对-[N-4-(2,2-二氰乙烯基)苯偶氮苯基-N-乙基]胺乙氧基聚苯乙烯

 本文报道通过高分子反应经氰乙烯基取代偶氮苯的偶合合成了含有高二阶非线性光学活性的以二氰乙烯基为电子受体烷胺基为电子给体的苯偶氮苯发色团的聚苯乙烯的衍生物及其表征。聚合物中的发色团含量在40mol％以上,易溶于四氢呋喃、丙酮等有机溶剂而得到均匀的薄膜。     

土壤-植物系统中的汞污染与农产品安全生产

对农产品的汞污染及其安全生产问题作了综述，内容包括：汞在土壤．植物系统中的循环，汞污染对农产品安全生产的威胁与对策措施，例如，可利用植物生物技术选育低积累汞的作物基因型、采取植物修复及相应的农艺措施，以进行有效的农产品安全生产与调控，减小环境中过量的汞对土壤．植物系统和食物链造成的危害，最终保障人体的健康。     

高氯酸诺氟沙星铜(Ⅱ)(英)

0CommentExtensiveinvestigationshavebeendoneaboutthesupramolecularchemistryofmetalionswithNor-floxacin(H-Norf,1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylicacid)sincemanyorganiccompoundsusedinmedicinedonothaveapurelyorganicmodeofaction;someareacti-vatedorbiotransformedbymetalions,othershavedi-rectorindirecteffectonthemetalionmetabolism[1~5].ThereactionofCu(ClO4)2·6H2OwithH-Norfunderhydrothermalconditionsgivesamonomericcomplex[Cu(H-Norf)2](ClO4)2(1)inwhichCu髤i…     

CTAB对四磺酸基酞菁钴与Na2S反应的影响

研究了十六烷基三甲基溴化铵（CTAB）对四磺酸基酞菁钴(CoTsPc)与Na₂S反应的影响，发现在CTAB存在下CoTsPc与Na₂S更易发生氧化还原反应生成轴向配合物HSCo(I)TsPc. 讨论了CTAB对该反应的作用机理. 采用多波长、双系数法解析反应平衡混合物的紫外吸收光谱，计算了该反应生成物的组成和反应的平衡常数. 从温度对反应平衡常数影响，得到了该反应的热力学数据. 在CTAB浓度为8.36×10^-3 mol•L^-1及303 K时，反应的ΔGΘ、ΔHΘ和ΔSΘ分别为－17.28 kJ•mol^-1、84.1 kJ•mol^-1 和335 J•mol^-1•K^-1.     

A Novel White Light Emitting Long-lasting Phosphor

A novel white light emitting long-lasting phosphor Cd1-xDyxSiO3 is reported in this letterThe Dy^3 doped CdSiO3 phosphor emits white light. The phosphorescence can be seen with the naked eye in the dark clearly even after the 254nm UV irradiation have been removed for about 30min. In the emission spectrum of 5% Dy^3 doped CdSiO3 phosphor, there are two emission peaks of Dy^3 , 580nm (^4F9/2→^6H13/2) and 486nm (^4F9/2→^6H15/2), as well as a broad band emission located at about 410nm. All the three emissions form a white light with CIE chromaticity coordinates x=0.3874, y=0.3760 and the color temperature is 4000 K under 254 nm excitation. It indicated that this phosphor is a promising new luminescent material for practice application.     

As(Ⅴ)存在下阻尼动力学荧光法测定痕量As(Ⅲ)

基于KBrO3与HCl反应,其产物能使丁基罗丹明B荧光猝灭,在As（Ⅴ）共存时As（Ⅲ）能灵敏抑制该反应,据此建立了测定痕量As（Ⅲ）的新方法.在最佳实验条件下,测定As（Ⅲ）的线性范围为7.7～153.8 ng/mL,方法的检出限为2.9 ng/mL.对30.8和92.3 ng/mL的As（Ⅲ）标准溶液平行测定11次,其相对标准偏差分别为1.3%和0.62%.并考察了常见物质的干扰情况.该方法用于环境水样中痕量As（Ⅲ）分析,回收率在98%～105%之间.并提出了可能的反应机理.     

新颖孤立的金属环组装而成的三维氢键超分子化合物的合成及晶体结构

A novel discrete dinuclear metaUacyclic copper（Ⅱ） complex, [Cu2L2（H2O）2]·3H2O （1） has been firstly prepared where L is derived from the 1 ; 2 condensation of 2,2＇-bipyridyl-3,3＇-diformylhydrazide and acetone during the formation of the complex. Single-crystal X-ray diffraction analysis determines that the complex consists of dinuclear metallacyclic units [Cu2L2（H2O）2] where two metal centers are linked together through two bis（chelating） bridge ligands L to form a bizarre cavity with size 0.9417 nm× 0.4999 nm× 0.6930 nm. Interestingly, the metal coordination also creates hydrogen bond sites that further aggregate these metallacycles into a 3D supramolecular structure with 2D perpendicular hydrophilic tunnels in crystal.     

酰基硫脲分子内氢键与取代基效应的定量关系

对２３个Ｎ－二茂铁甲酰基－Ｎ’－芳基硫脲和４个Ｎ－苯甲酰基－Ｎ’－芳基硫脲的δβ－ＮＨ与各种取代胺的碱性强度ｐＫｂ及苯环下取代基常数σ进行了系统的定量关系研究。结果提示了此类化合物的分子内氢键与取代基效应之间的定量关系。